Research Benchmark: Can NNs break cryptography schemes?

Create a table of substitution ciphers (https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Substitution_cipher)<p>Create a database of books. Encrypt all of the books with a substitution cipher. (Is there a corpus of free books available somewhere?)<p>Run the books through progressively deeper neural networks, training them to break the code.<p>Create a table where the rows are the substitutions and the columns are the neural depth.<p>Is there a trend?<p>Instead of substitutions, a similar benchmark could be made with other cryptographic algorithms.